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Amino acid differences in the hemagglutinin (HA) antigenic sites of pig ID 380 at week 5 and week 22. Amino acid positions were numbered using the H3 numbering system.
| Antigenic Sites (H1 HA Gene Segment) | Amino Acid Changes |
|---|---|
| Cb | S82N |
| Sa | S156K, R158G, G159N, L164I, S165N, G166N |
| Sb | Y188D, R189S |
| Ca1 | G173E, S206T |
| Ca2 | F140S, H141Y, A144S, N145K, E225T |
